tegra-usb.txt 1.1 KB

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  1. Tegra SOC USB controllers
  2. The device node for a USB controller that is part of a Tegra
  3. SOC is as described in the document "Open Firmware Recommended
  4. Practice : Universal Serial Bus" with the following modifications
  5. and additions :
  6. Required properties :
  7. - compatible : Should be "nvidia,tegra20-ehci" for USB controllers
  8. used in host mode.
  9. - phy_type : Should be one of "ulpi" or "utmi".
  10. - nvidia,vbus-gpio : If present, specifies a gpio that needs to be
  11. activated for the bus to be powered.
  12. Optional properties:
  13. - dr_mode : dual role mode. Indicates the working mode for
  14. nvidia,tegra20-ehci compatible controllers. Can be "host", "peripheral",
  15. or "otg". Default to "host" if not defined for backward compatibility.
  16. host means this is a host controller
  17. peripheral means it is device controller
  18. otg means it can operate as either ("on the go")
  19. - nvidia,has-legacy-mode : boolean indicates whether this controller can
  20. operate in legacy mode (as APX 2500 / 2600). In legacy mode some
  21. registers are accessed through the APB_MISC base address instead of
  22. the USB controller.